|Full name||Jonas Elmer|
|Date of birth||28 February 1988|
|Place of birth||Zürich, Switzerland|
|Height||1.76 m (5 ft 9 in)|
|Playing position||Left Back|
|2012||→ AC Bellinzona (loan)||12||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 28 May 2014.
‡ National team caps and goals correct as of 18 May 2008
Jonas Elmer (born 28 February 1988) is a Swiss footballer who is a free agent.
Elmer was signed by English Premier League side Chelsea in the summer of 2005 from Grasshoppers. He featured regularly for the Chelsea reserve and youth teams in both the 2005–06 and 2006–07 seasons.
Elmer made his first start for Chelseas first team when coming on from the substitutes bench in a pre-season fixture against A.C. Milan, where he played the remainder of the match. His second appearance was against Wycombe Wanderers on 13 July 2005. Chelsea went on to win the game 5–1. He also came on as a substitute to make his third appearance for the club four days later as Chelsea F.C. beat Portuguese club Benfica 1–0 in another pre-season fixture.
Elmer looked as though he could have a promising future at Chelsea and signed a new two-year contract in early April 2006.
On 25 June 2007, Elmer traveled back to Switzerland and signed a two-year contract with FC Aarau